Pollutant Concentrations

Air quality readings will be available hourly from 7am to 11pm. Air quality readings from 12am to 6am will be made available at 7am on the same day.

Readings on 17 Nov 2014

View reading for:

Region

24-hr Sulphur dioxide(µg/m3)

24-hr PM10(µg/m3)

1-hr Nitrogen dioxide(µg/m3)a

8-hr Ozone(µg/m3)

8-hr Carbon monoxide(mg/m3)

24-hr PM2.5(µg/m3)

North

5(3)

22(22)

32(-)

14(6)

0.3(3)

11(44)

South

8(5)

24(24)

35(-)

5(2)

0.5(5)

14(53)

East

5(3)

17(17)

16(-)

26(11)

0.4(4)

12(50)

West

5(3)

20(20)

30(-)

21(9)

0.5(5)

11(45)

Central

10(7)

18(18)

33(-)

18(8)

0.5(5)

11(48)

1-hr PM2.5 (µg/m3)b Readings on 17 Nov 2014

View reading for:

Time

1am

2am

3am

4am

5am

6am

7am

8am

9am

10am

11am

12pm

North

25

13

8

9

12

12

11

9

12

9

11

8

South

10

11

8

8

7

11

5

13

10

29

42

34

East

23

20

16

15

16

13

11

6

10

23

16

10

West

13

6

11

7

8

4

19

9

8

14

16

14

Central

11

13

11

10

12

12

12

15

11

5

23

21

Time

1pm

2pm

3pm

4pm

5pm

6pm

7pm

8pm

9pm

10pm

11pm

12am

North

10

10

16

7

5

5

6

4

8

9

12

-

South

15

31

31

10

7

3

11

6

9

3

3

-

East

7

15

16

6

10

6

8

3

6

8

11

-

West

17

15

24

18

5

3

5

9

3

8

10

-

Central

5

17

30

3

6

8

8

10

9

5

3

-

Note:a Sub-index for nitrogen dioxide is reported only when the 1-hr concentration equals or exceeds 1130 µg/m3.

b There is no sub-index for 1-hr PM2.5.

3-hr PSI Readings from 1am to 12am on
17 Nov 2014

Time

1am

2am

3am

4am

5am

6am

7am

8am

9am

10am

11am

12pm

3-hr PSI

53

54

52

46

44

44

46

45

45

51

55

58

Time

1pm

2pm

3pm

4pm

5pm

6pm

7pm

8pm

9pm

10pm

11pm

12am

3-hr PSI

56

55

57

56

52

29

26

26

28

27

29

-

Hourly updates of 3-hr PSI readings are provided from 7am to 11pm. The 3-hr PSI readings from 12am to 6am will be made available at 7am on the same day. The 3-hr PSI readings are calculated based on PM2.5 concentrations only.